Originally Posted by Couchpotato
Watch the tv series or read the books they explain in detail how it happens the games don't.

Really? I felt that the Witcher 1 explained everything about becoming a witcher, that needed to be said. You even visit the lab where it was done, right in the beginning. I've read all 7 Witcher books and I don't remember more information about the process from them - which would mean there is next to none.